{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:32:44.944Z","years_from_j2000":26.679,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-75479","name":"HD 75479","class":"k1iii_orange_giant","category":"star","object_type":"K1III orange giant","mag":8.34,"mag_band":"V","abs_mag":0.852,"abs_mag_band":"V","distance_ly":1025.648957812468,"distance_method":"parallax","ra_deg":132.07324500000001,"dec_deg":-49.543843,"epoch_ra_deg":132.285015,"epoch_dec_deg":-49.642179,"epoch_moved_arcsec":1.675,"pm_ra_mas_yr":-36.56,"pm_dec_mas_yr":51.06,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vela","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-75479","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":376739980,"mass_solar":3.003,"radius_solar":9.838,"spectral_type":"K1III","color_index_bv":1.072,"luminosity_solar":39.73745050614631,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":2.709,"surface_temperature_k":4868,"proper_motion_ra_mas_yr":-36.56,"proper_motion_dec_mas_yr":51.06,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":47.914},"designations":[{"catalog":"HD","designation":"HD 75479"},{"catalog":"HIP","designation":"HIP 43222"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}